diff --git a/web/README.md b/web/README.md
index 32d1a0f..08f0af7 100644
--- a/web/README.md
+++ b/web/README.md
@@ -58,6 +58,11 @@ change them unless you know what you want.
   configuration. This is a separate configuration from`SERVE_FROM_DOMAIN` as
   latter is used for other purposes too.
 
+- `POSTORIUS_TEMPLATE_BASE_URL`: The base url at which the `mailman-web`
+  container can be reached from `mailman-core` container. This is set to
+  `http://mailman-web:8000` by default so that Core can fetch templates from
+  Core.
+
 Running
 =======
 
diff --git a/web/mailman-web/settings.py b/web/mailman-web/settings.py
index d283637..d7cc6e3 100644
--- a/web/mailman-web/settings.py
+++ b/web/mailman-web/settings.py
@@ -403,6 +403,8 @@ Q_CLUSTER = {
     'orm': 'default',
 }
 
+POSTORIUS_TEMPLATE_BASE_URL =  os.environ.get('POSTORIUS_TEMPLATE_BASE_URL', 'http://mailman-web:8000')
+
 try:
     from settings_local import *
 except ImportError: